VWVortex - DIY - Wiring a Euro Headlight Switch to run Pull a little excess wiring out of the dash so you have something to work with. Step 3- Test your Euro switch to be sure that pin #3 is for the parking lights, DIY - Wiring a Euro Headlight Switch to run parking lights (MkVI GTi) Posting Permissions. Mk4 Euro Switch Wiring Diagram a plate mk4 the power comes from the ignition switch to pins 1 then. DIY: Fog lights mk4 harness wiring diagram. now if you had the euro switch and the jetta headlights with fogs. and you want to do grill fogs. For VW Jetta MK4 Bumper Driving Full Bright LED Fog Light W/Switch + Wiring + Relay . VW Jetta MKIV/MK4: Euro Headlight Wiring Diagram I HAVE EURO SWITCH. I'm needing a diagram with descriptions of the function of each Pin on the just disregard that part but it will show you where the wires go on the headlight. you shouldn't need to mess with the euro switch just make sure the wiring on the headlights match the wiring from the car that MK4 BUY / SELL / TRADE; MK5 Vw Golf Mk4 Headlight Switch Wiring Diagram | Diagram Visit the post for more. Vw golf jetta turn signal arm removal simple easy steps vw mk4 fog light wiring kit ecs tuning jetta headlight switch diagram vw golf mk4 headlight switch wiring diagram power master mirror window button for vw golf mk4 headlight switch wiring diagram 5 pcs window mirror Mk4 rear fog euro wiring diagram needed. - TDIClub Forums Does anybody have a wiring diagram from a euro MK4 Jetta/Bora for the rear fog lights? I am asking because my 99.5 has a wire going from the headlight switch to the cluster. The wire at the switch is much thicker than at the cluster. I was trying to figure out where the heck that wire goes to.